In the following reaction the oxidation state of phosphorus changes from ____ to ____? P4 + H2O + HNO3 -> H3PO4 + NO

A) +4, +5
B) 0, +6
C) O, +5
D) +5, +6

Answer: B

Explanation: The answer is B

The balanced equation of the decomposition reaction of ozone is written as below:

[tex]\rm O + O_{3} \rightarrow 2O_{2}[/tex]

Hence, option b is correct.

Ozone is a toxic gas formed by the combination of atmospheric oxygen with nascent oxygen gas. Ozone exists as a layer in the stratospheric layer of the atmosphere.

Ozone protects earth from harmful UV rays. Decomposition of ozone results in depletion of ozone layer which leads to the UV radiation reaching intensely to the earth's surface.

The oxygen gas formed from the decomposition of ozone further reacts with sulphur gas as written above produce harmful sulphur dioxide. Sulphur dioxide further reacts with water forms sulphuric acid causes acid rain.

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Answer:

6M

Explanation:

No of mole = concentrate × volume

n= c × V

C= n/V

V=500mL=0.5L

C= 3/0.5=6M

Potassium carbonate reacts with barium chloride to precipitate insoluble barium salts that is barium carbonate, when the solutions are mixed together you'll see white precipitate that is barium carbonate and potassium is dissolve in the solution to form potassium chloride.

Answer:

the answer is False.

Explanation:

the indicator solution is directly related to the PH. When the solution becomes neutral (ph 7), the indicator will become clear.

The statement that Phenolphthalein is not affected by PH is False

Therefore, PH do affect Phenolphthalein indicator

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The sodium has a larger atomic radius than chlorine because it is in column 1. Therefore, option (A) is correct.

Atomic radius can be defined as half of the distance between two adjacent atoms of the same chemical element in a molecule. The atomic radius of chemical elements is of the order of 1.2 x 10⁻¹⁰ m.

The electron cloud around the nucleus acts as the atom's shell. It does not have a fixed shape which makes it difficult to determine the atomic size.

The atomic radius of sodium is larger than that of chlorine. As both Na and Cl belong to the 3rd period, so the atomic size generally decreases across the period as we move from left to right.

The sodium is placed in column 1 while chlorine is placed in column 17. The effective nuclear charge will increase as the atomic number increases. With increased effective nuclear charge electronegativity of the nucleus increases which results in the increased attraction of electrons to the nucleus.

Therefore, the atomic radius of sodium is larger than that of chlorine.

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2NaOH + CuBr2 => 2NaBr + Cu (OH)2

Answer:

The answers are either 1 or 4

Explanation:

I am pretty dure it is 1

If two objects A and B of same temperature are in contact with each other, there will be no transfer of heat. Hence, option A is true.

Heat is the transfer of energy from one object to another, for this transfer it is necessary that there is difference between the temperature of the objects.

In this question the objects A and B of the same temperature are in contact with each other, and the law of transfer of heat energy says without temperature difference there will be no heat transfer, hence the option A which says "Although the molecules collide, no heat transfers because there is no temperature difference between the objects" is correct.

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Answer:

[O₂(g)] = 0.0037M

Explanation:

            2SO₂(g) + O₂(g) => 2SO₃(g)

Conc:   [SO₂(g)]   [O₂(g)]     [SO₃(g)]  and  [SO₂(g)] = [SO₃(g)]

Kc =  [SO₃(g)]²/[O₂(g)][SO₂(g)]² => Kc = 1/[O₂(g)] = 270 if [SO₂(g)] = [SO₃(g)]

∴ [O₂(g)] = (1/270)M = 0.0037M  

The equilibrium constant Kc is the ratio of concentration of products to the product of concentrations of reactants. Here, the concentration of O₂ will be 0.0037 molar.

Kc of a reaction is the equilibrium constant of that reaction expressed in terms of concentration of products and reactants. It is the ratio of product of molar concentration of products to the product of molar concentration of the reactants.

An equilibrium mixture of a reaction is attained when the reaction in both forward and backward reaction occurs in same rate.

The equilibrium constant Kc for the given reaction can be written as follows:

[tex]Kc = \frac{[SO_{3}]}{[SO_{2}][O_{2}]} = 270[/tex]

Provided that the concentrations [SO₃] and [SO₂ are equal and thus the expression becomes:

Kc = 1/[O₂] = 270

[O₂] = 0.0037 M

Hence, the molar concentration of oxygen in equilibrium mixture of the reaction is 0.0037 molar.

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Answer:

An open carbonated drink is an example of a saturated solution.

Explanation:

A carbonated drink is a saturated solution of carbon dioxide in water under a certain pressure. If the soft drink container is opened, the pressure on the surface of the drink is decreased to atmospheric pressure, and several carbon dioxide molecules leave the solution, and if enough time passes, the drink will end without gas.

Answer:

It is an example of an Aqueous solution.

Explanation:

A solution is a mixture that contains one or more solutes in a solvent. It can be in a solid, liquid or gaseous form, or the combination of two or more.

A carbonated drink is a solution that contains majorly liquids and gases. The main gas is the carbon (IV) oxide that has been used to preserve its taste.

When a bottle of carbonated drink is opened, the gas (carbon dioxide) stored under pressure escapes and evaporates. Thereby causing bubbles to move within the content of the bottle.

This is an example of an aqueous solution because the major solvent in the drink is water.

Answer:

answer pl

please

because I

Answer:

the correct answer is C) K+ and Br-

Explanation:

Spectator ions are the ions on the right side of the equation which do not combine to form products. we can see that potassium ions (K+) and bromine ions (Br-) appear unreacted on both sides of the equation

Final answer:

The rapid change in Earth's climate is primarily due to the burning of fossil fuels, which has led to increased greenhouse gas emissions and trapped more solar radiation in our atmosphere. Seventeen of the warmest years on record have occurred since 2000, highlighting the swift pace of climate change due to human activities.

Explanation:

The Earth's climate has undergone rapid changes in recent years, largely due to human activities rather than natural climatic variations. The most significant factor causing this rapid climate change is the burning of fossil fuels, leading to increased levels of greenhouse gases, such as carbon dioxide, in the atmosphere. This human-induced acceleration of climate change is clearly demonstrated by the fact that we have witnessed 17 of the 18 warmest years on record since the year 2000. Option C

Fossil fuels burned for energy during and after the Industrial Revolution have allowed advances in public health, food production, and urbanization. However, this has come at the expense of our environment. The greenhouse gas emissions trap solar infrared radiation, leading to a warming effect. This anthropogenic warming disturbs ecological relationships and has manifold influences on global temperatures, precipitation patterns, polar ice melting, sea levels, and biodiversity.

While natural factors such as volcanic activity, changes in the sun's intensity, and Earth's orbital shifts do contribute to climate variability, the unprecedented rate of current global warming is predominantly tied to human activity. This underscores the urgent need for mitigating greenhouse gas emissions to prevent further environmental degradation.

One lithium (Li) atom can combine with one fluorine (F) atom. Together, they make the formula LiF. Fluorine has seven electrons of it's own. Lithium gives up its one electron to make both atoms happy. So the fluorine atom has eight electrons, and a filled outer shell.

An image is attached for reference.

Answer:

Velocity is the rate of change of displacement( change of distance in a particular direction with respect to time) , and acceleration is the rate of change of velocity per unit of time. ... Also, speed is a scalar quantity but velocity and acceleration are vector quantities.

Explanation:

Answer:

18.01534

The last one

Explanation:

The molar mass of H20 is 15.9994+(2 x 1.00797) which equals 18.01534 grams/mole.

The isotopes hydrogen-2 (deuterium) and hydrogen-3 (tritium) differ in the number of neutrons in their nuclei. Option B is the answer.

The isotopes hydrogen-2 (deuterium) and hydrogen-3 (tritium) have different numbers of neutrons in their nuclei. Deuterium has one more neutron than hydrogen-1, while tritium has two more neutrons than hydrogen-1. The difference in the number of neutrons gives these isotopes different properties and behaviors.

Option B is the correct answer: tritium has one more neutron than deuterium. The number of electrons and protons in isotopes of an element remains the same, so options A and C are incorrect. Option D is also incorrect because deuterium and tritium are different isotopes of hydrogen with different numbers of neutrons.

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Answer:

The coefficient is 1

Explanation:

CaO(s) + CO2(g) -> CaCO3(s)

In the balanced equation, the coefficient for CaO is 1

The coefficient represents the number of moles of a compound in the stoichiometry of the reaction

Final answer:

The coefficient for calcium oxide in the reaction CaO(s) + CO₂(g) → CaCO₃(s) is 1. The reaction is in stoichiometric balance, with each reactant and product having a coefficient of 1, indicating a 1:1:1 molar ratio.

Explanation:

The coefficient for calcium oxide in the equation CaO(s) + CO₂(g) → CaCO₃(s) is 1. In chemical reactions, the coefficients indicate the number of moles of each substance involved in the reaction. In this case, one mole of calcium oxide reacts with one mole of carbon dioxide to produce one mole of calcium carbonate, making the coefficient for each reactant and product 1. This balanced equation represents a stoichiometric relationship, meaning the number of atoms for each element is conserved.

Moreover, understanding the reaction between calcium oxide and water or carbon dioxide and water provides important context. Calcium oxide reacts with water to form calcium hydroxide (Ca(OH)₂), and carbon dioxide reacts with water to form carbonic acid (H₂CO₃). However, these are separate reactions from the one in the question. The decomposition reaction of calcium carbonate into calcium oxide and carbon dioxide is represented by the equilibrium equation: CaCO₃ (s) ⇌ CaO (s) + CO₂ (g). This equilibrium illustrates that the reaction can proceed in both the forward and reverse directions, and under certain conditions, can achieve a 100% yield of calcium oxide if the carbon dioxide is continuously removed.

The molarity is 3.50 M/L.

Explanation:

Molarity is found to know the amount of the solute ions present in the given volume of solution. So we determine it using the ratio of the moles of solute to the volume of the solution.

As here the weight of the solute which is hydrochloric acid is given as 17g, so we need to find the moles of it. This can be done by dividing the given amount of HCl with the molecular weight of HCl.

Molecular weight of HCl = 1.01 + 35.45 = 36.46 g/mol

So the number of moles of HCl present here will be

[tex]No.of moles = \frac{17}{36.46} =0.466[/tex]

So, 0.466 moles of HCl is present in the solution.

[tex]Molarity = \frac{No.of moles of solute}{Volume of solution} = \frac{0.466}{133*10^{-3} }[/tex]

[tex]Molarity = 3.50 M/L[/tex]

Thus, the molarity is 3.50 M/L.

Answer:

82 grams of sodium nitrate (NaNO2) will dissolve in 100 grams of water at 20°C.

Explanation:

90.0 grams of sodium nitrate (NaNO2) will dissolve in 100g of water at 20°C.

To determine the grams of sodium nitrate (NaNO2) that will dissolve in 100g of water at 20°C, we can use the solubility data for NaNO2 at that temperature.

According to the solubility data:
- Solubility of NaNO2 in water at 20°C = 90.0 g/100 g water

This means that 100g of water can dissolve 90.0g of NaNO2 at 20°C.

So, if we have 100g of water, the maximum amount of NaNO2 that can dissolve in it is 90.0g.

Therefore, 90.0 grams of sodium nitrate (NaNO2) will dissolve in 100g of water at 20°C.

Answer:

im pretty sure its 1.3 if its wrong sorry

Explanation:

Answer:

I would say A

Explanation:

our ancestors are the people that lived long before us

Answer:

2, 3, and 1

Explanation:

red water in hot water

rose to the top of the beaker

warmer than

The red water in hot water model showed convection. In the convection model, the red water on the bottom of the beaker rose to the top of the beaker. This means that the water at the bottom of the beaker was warmer than the water near the top of the beaker.

Convection is the transfer of heat from one place to another due to the movement of fluid. Although often discussed as a distinct method of heat transfer, convective heat transfer involves the combined processes of conduction (heat diffusion) and advection. Convection is usually the dominant form of heat transfer in liquids and gases.

Note that this definition of convection is only applicable in Heat transfer and thermodynamic contexts. It should not to be confused with the dynamic fluid phenomenon of convection, which is typically referred to as Natural Convection in thermodynamic contexts in order to distinguish the two.

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Your question is incomplete, but most probably your full question was,The particles of a liquid, such as water, are more able to move around than the particles of a solid, such as foil. Water particles with more heat move to areas where there are water particles with less heat. In other words, convection allows heat to be transferred from warmer places to cooler places. Complete the sentences to describe the convection experiment The model showed convection. In the convection model, the red water on the bottom of the beaker This means that the water at the bottom of the beaker was the water near the top of the beaker.

It Is A Type Of Lily

Regarded botanically as perennial with the scientific name herbaceous perennial, Agapanthus Peter Pan is an African lily. Hence, it’s also called as “The Blue African Lily of the Nile”. The flowers appear in trumpet-shaped rounded clusters with darker mid-vein petals.

They come out in an upright position due to its long stalks and are surrounded by narrow, loose and strap-shaped leaves. In addition, some categorize the plant under bulbs although it’s not, but due to the fact that it has fleshy and thick roots.

#3 – It Has Other Names

There are other terms known for Agapanthus Peter Pan. Other than simply African lily, this is often called as The Blue African Lily of the Nile, African Lily Peter Pan, Lily of the Nile Peter Pan, Dwarf Lily of the Nile and Dwarf African Lily.  This also explains the reason why most of the imported evergreen agapanthus came from certain parts of South Africa as these are better grown in milder climate areas with higher or heavy rainfall.

Therefore, the flowers typically bloom from the months of July to August, which are commonly known as the summer season in the US, Canada and Europe, and extends up to October. Of course, you’d see the glamorous, blue flowers in spring too.

#5 – It Needs Full Sun

This beautiful flower relies on sunlight in order to grow and remain healthy. However, planting it around a partly shaded area is alright.

You also have to keep in mind that this kind of plant must not be dried out or else it dies. Thus, watering regularly is a basic priority.

#6 – It Can Survive The Winter

Although it’s best planted in milder areas and sunny season, Agapanthus Peter Pan can endure the coldness of fall and winter seasons. In fact, you can place foliage in a pot or a small container so you can easily transport it inside your home.

This also implies that you don’t need a large, spacious garden to display this plant around your surroundings.

#7 – It Is Not Shrubby

Unlike some plants, Agapanthus Peter Pan grow in almost round, V-shape without spreading in a way that it reaches to an unparalleled position.

Its spread extends from 1 to 2 inches. Nevertheless, it can definitely create an elegant landscape view whether it’s planted in front of your house or in the backyard.

Based on an article excerpt from Plant Care Today, Agapanthus plants generally grow from 18 inches to 5 feet depending on the variant. But for Agapanthus Peter Pan, it can grow to a minimum height of 8 inches to 18 inches.

#8 – It Most Likely Grows In Moist, Drained Soil

In addition to the climate, remember that plants are best nurtured in an area where the kind of soil is met. It has to be a soil type of chalk, clay, loam or sand. In the case of Agapanthus Peter Pan, fertile, moist and well-drained soil must be considered.

#9 – It Is Easy To Grow

This plant requires low maintenance. All you need is enough sun, water and well-drained soil. Consider adding some organic material for fertilizing if you want to keep the plant healthy and flowers stunningly beautiful.

#10 – It Attracts Butterflies And Birds

The beauty of the blue flowers of Agapanthus Peter Pan is evident and undeniable due to the fact that they are favorite places for small birds and butterflies to go to. An even more so interesting fact is that it’s free from pests and diseases. It is also rabbit, deer and drought resistant.

Growing and Maintenance Tips:

As mentioned previously, Agapanthus Peter Pan is less difficult to take care of. But doing the right way is still vital to bear in mind. So here’s a list of quick tips on how to properly plant this agapanthus for beginners and maintain its beautiful foliage.

The Planting Process

1. If you choose to plant in the ground, dig holes but not too deep.

2. Amend the soil with some organic matter as fertilizer.

3. Carefully remove the plants from the containers and make sure the root ball is intact.

4. Loosen the soil and roots around the bottom as well as the edges of the root ball.

5. Place the plant in the hole leveling with surrounding soil, and spread roots outward.

6. Fill in the hole and around the roots with amended native soil.

7. Gently water.

8. Cover the whole area with leaf or bark.

9. Water again but this time deeply.

The Regular Watering Process

Water every morning. Night watering may promote diseases. As you water, go slowly and deeply, and if possible, do it twice with a few minutes apart. Keep in mind that you avoid over watering as this can cause some root problems. To conserve water, use a hose.  Just keep the soil wet! And water the flowers everyday!

Answer: The amount of water she pours on the model

Explanation: Nancy wants to test how a hill's slope can affect erosion. Because of this, she will want to change the height of one end of her hill model as she pours water down the slope. Other variables, such as the amount of water she pours on the model and the type of soil she uses, should not change.

Answer: TRUE

Explanation: I’d say it is true because lava comes out of volcanos and lava is obviously VERY hot so it must help warm the planet by realizing carbon dioxide.

Answer:

True.

Explanation:

If no modification is there, such as in melting, the property or change is termed physical. In comparison, chemical properties or changes involve changes in the composition of the substance. The ability to react with oxygen is a chemical property

The ability to react with oxygen is a physical property. - False

Chemical properties are characteristics of a substance that describe how it interacts with other substances or undergoes chemical reactions. These properties include reactivity, flammability, acidity or alkalinity (pH), and the ability to form chemical bonds. Chemical properties help identify and classify substances based on their behavior in chemical processes.

The ability to react with oxygen is a chemical property, not a physical property. Chemical properties describe how a substance interacts with other substances and undergoes chemical changes. Reacting with oxygen involves a chemical change where a substance combines with oxygen to form new compounds or undergoes oxidation.

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Answer:

ionic compounds contain both types of ions,like postie or negative

Explanation:

Answer: Some of the original base remains in the solution.